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1998年3月23日,在法属圭亚那库鲁空间中心,阿里安4运载火箭成功地发射了SPOT4地球观测卫星。 SPOT 4主要由法国国家空间研究中心(CNES)负责。它的主要作用就是挽回SPOT 3的失去的成像能力和作为向SPOT 5过渡的桥梁。SPOT 3于1996年发射升空,由于陀螺仪失效
On 23 March 1998, the Arion 4 launch vehicle successfully launched the SPOT4 Earth Observation Satellite at the Kourou Space Center in French Guiana. SPOT 4 is mainly managed by the National Center for Space Research (CNES) of France. Its primary role is to restore the lost imaging capabilities of the SPOT 3 and serve as a bridge to the SPOT 5 transition. SPOT 3 was launched in 1996 due to failure of the gyroscope